Thor's depressive reaction and descent into drinking is very and unfortunately common in people in critical incident professions. At least 30 percent of folks we know about have serious problems. It's only in comics were heroes go through such repeated stress and don't lose it. Worked with some folks in those situations, one incident can generate flashbacks, nightmares, depression, cognitive problems, etc. Calling someone cowardly is just BS. Nowadays, our folks get talks on such when entering those professions (if they work for a good outfit). I doubt Asgard Academy ran lectures on mental health being such 'warrior' types.
Folks won't get help as they fear being called cowards and fear mental health status reports that will hurt their employment status. Terrible thing. Unless you've been through it or worked with those who have, you don't know what you are talking about if you criticize them.